绝缘层一般为纯天然橡胶，铜丝为无氧铜，这样，才能保证线芯的良好导电性及电缆的安全性。
The insulating layer is pure natural rubber, copper wire for copper, so, in order to ensure the safety of wire and cable of good conductivity.
测量绝缘电阻的例子包括测量印制板上走线之间的通路，或多芯电缆中导线之间的电阻。
Examples of insulation resistance measurements include measuring the path be tween traces on a printed circuit board or the resistance between conductors in a multi-conductor cable.
补偿导线的线芯绝缘厚度，护套厚度及最大外径。
Insulation thickness, sheath thickness and maximum overall diameter.
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